<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>使用 jsx</title>
</head>

<body>
  <div id="root">

  </div>
  <script crossorigin src="https://unpkg.com/react@16/umd/react.development.js"></script>
  <script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
  <script src="https://unpkg.com/babel-standalone@6/babel.js"></script>
  <script type="text/babel">

      ReactDOM.render(
        <h1>Hello, world!</h1>,
        document.getElementById('root')
      );

    </script>
</body>

</html>